Optionals IAS Mains Physics: Questions 178 - 182 of 307

Access detailed explanations (illustrated with images and videos) to 307 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 750.00 -OR-

How to register? Already Subscribed?

Question 178

Edit

Appeared in Year: 2010

Describe in Detail

Essay▾

Draw a two stage RC coupled transistor amplifier. Plot the frequency response and indicate the lower and upper cut off frequencies and the bandwidth.

Explanation

  • Fig (1) shows how to couple two stages of amplifiers using resistance – capacitance (RC) coupling scheme. In this scheme, the signal developed across the collector resister of the first stage Is coupled to the base of thee second stage through the capacitor . The coupling capacitor blocks the dc voltage of the first stage from reaching the base o…

… (563 more words) …

Question 179

Appeared in Year: 2010

Describe in Detail

Essay▾

Predict from the single particle shell model the shell configuration, ground state spin and parity for the following nuclei:

,

Explanation

The shells are filled according to

The lost particle is a proton with spin the ground state spin, according to the single particle model for this is .

Since last proton goes to state i.e..

Parity is given by ground state spin and parity

The shells are filled according to

The last particle is a nucleon and ground state spin is . Since (for orbit…

… (5 more words) …

Question 180

Edit

Appeared in Year: 2010

Describe in Detail

Essay▾

Why NAND and NOR gates are called universal gates? Give the logic diagram, Boolean equation and the truth table of a NAND gate. Design and NOR gate using only NAND gates.

Explanation

NAND and NOR gates are said to be universal gates becomes any digital system can be implemented with these gates. Any Boolean or logic expression can be realized with AND, OR and NOT gates but the NAND and NOR gates are more common from the hardware point of view because they are readily available in IC form. Sequential circuits as well as combinat…

… (277 more words) …

Question 181

Edit

Appeared in Year: 2010

Describe in Detail

Essay▾

What is Raman Effect? How does it differ from Rayleigh scattering? Explain Raman Effect on the basis of quantum mechanical theory.

How Raman Effect is experimentally studied? What are the advantages of using laser sources in the study of Raman Effect?

Explanation

In 1928, Sir C. V Raman discovered that when a beam of monochromatic light was passed through an organic liquid such as benzene, the scattered light was found to contain a strong line of frequency equal to the frequency of the incident link . This is referred to as Raman scattering. The Scattering of light with change of frequency is known as Rama…

… (1302 more words) …

Question 182

Spectroscopic Notation of Atomic States
Edit

Appeared in Year: 2010

Describe in Detail

Essay▾

What are magic numbers? Discuss shell structure of a nucleus. How is this model able to explain various properties of nuclei? Discuss the limitations of this model. (25 marks)

Explanation

The electrons in an atom may be thought of as occupying positions in “shells” designated by the various principal quantum numbers. The degree of occupancy of the outermost shell is what determines aspects of an atom behaviour. For instance, atoms with etc have all their electron shells completely filled. Such electron structures have high binding …

… (882 more words) …